1. Observe the fault light status.
If the fault light is off, the code may have been cleared. However, note that some fault lights may still illuminate after the problem is resolved; other methods should be used for verification.
2. Use diagnostic equipment.
Connect a professional diagnostic tool to read the fault codes stored in the ECU. If "No fault codes" is displayed or historical fault codes are cleared, the code has been cleared. This is the most accurate method.
3. Verify that the fault has been eradicated.
After clearing the code, ensure that the root cause of the fault has been resolved (e.g., replacing damaged sensors, repairing wiring, etc.). Otherwise, the code may reappear.
4. Be aware of temporary fault codes.
Some temporary fault codes may clear automatically after the problem is resolved, but permanent fault codes require manual intervention.
Tip: Clearing codes without resolving the fault may cause equipment malfunction; it is recommended to prioritize troubleshooting and repairing the problem.
